/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.trino.plugin.eventlistener.kafka.metadata;

import java.util.Map;
import java.util.stream.Collectors;

import static java.util.Objects.requireNonNull;

public class EnvMetadataProvider
        implements MetadataProvider
{
    protected final String prefix;

    public EnvMetadataProvider(String prefix)
    {
        this.prefix = requireNonNull(prefix, "Prefix must be populated");
    }

    @Override
    public Map<String, String> getMetadata()
    {
        return filter(System.getenv());
    }

    protected Map<String, String> filter(Map<String, String> metadata)
    {
        return metadata.entrySet().stream()
                .filter(e -> e.getKey().startsWith(prefix))
                .collect(Collectors.toMap(e -> e.getKey().substring(prefix.length()), Map.Entry::getValue));
    }
}
